*{
    padding: 0;
    margin: 0;
    list-style: none;
}

#picList{
    margin: 30px auto;
    width: 500px;
    background: green;
    height: 600px;
    overflow: hidden;
}

#picList li{
    height: 200px;
    font-size: 50px;
}

#picList li div{
    width: 200px;
    height: 200px;
    background: url(../images/1.png) no-repeat;
    background-size: contain;
    display: inline-block;
    vertical-align: middle;
}